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Intangible assets, net - Intangible Assets Other than Goodwill (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 111,826 $ 111,264
Accumulated amortization (19,012) (12,733)
Net intangible assets 92,814 98,531
Software Developed for Internal Use [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross amount 15,850 11,438
Accumulated amortization (991) (505)
Net intangible assets $ 14,859 $ 10,933
Software Developed for Internal Use [Member] | Minimum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 3 years 3 years
Software Developed for Internal Use [Member] | Maximum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 10 years 10 years
Acquired Proprietary Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 5 years 5 years
Gross amount $ 11,382 $ 13,532
Accumulated amortization (3,555) (2,660)
Net intangible assets 7,827 10,872
Customer Relationship [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross amount 34,986 34,986
Accumulated amortization (7,234) (4,840)
Net intangible assets $ 27,752 $ 30,146
Customer Relationship [Member] | Minimum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 7 years 7 years
Customer Relationship [Member] | Maximum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 10 years 10 years
Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 20 years 20 years
Gross amount $ 16,357 $ 18,057
Accumulated amortization (1,277) (916)
Net intangible assets $ 15,080 $ 17,141
Domain Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 20 years 20 years
Gross amount $ 191 $ 191
Accumulated amortization (15) (10)
Net intangible assets 176 181
Databases [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross amount 31,292 31,292
Accumulated amortization (5,159) (3,354)
Net intangible assets $ 26,133 $ 27,938
Databases [Member] | Minimum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 5 years 5 years
Databases [Member] | Maximum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 10 years 10 years
Non-competition Agreements [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 1,768 $ 1,768
Accumulated amortization (781) (448)
Net intangible assets $ 987 $ 1,320
Non-competition Agreements [Member] | Minimum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 2 years 2 years
Non-competition Agreements [Member] | Maximum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 5 years 5 years